diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1afb1b408..1a6970a7c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -41,7 +41,7 @@ jobs:
       DISABLE_SPRING: 1
     services:
       postgres:
-        image: postgres:14
+        image: postgres:15
         env:
           POSTGRES_USER: good_job
           POSTGRES_DB: good_job_test
@@ -77,24 +77,24 @@ jobs:
     strategy:
       matrix:
         ruby: [2.6, 2.7, "3.0", 3.1, 3.2, jruby-9.3]
-        pg: [14]
+        pg: [15]
         include:
-          - ruby: "3.0"
-            pg: 10
-          - ruby: "3.0"
+          - ruby: 3.2
             pg: 11
-          - ruby: "3.0"
+          - ruby: 3.2
             pg: 12
-          - ruby: "3.0"
+          - ruby: 3.2
             pg: 13
-          - ruby: jruby-9.3
-            pg: 10
+          - ruby: 3.2
+            pg: 14
           - ruby: jruby-9.3
             pg: 11
           - ruby: jruby-9.3
             pg: 12
           - ruby: jruby-9.3
             pg: 13
+          - ruby: jruby-9.3
+            pg: 14
     env:
       PGHOST: localhost
       PGUSER: good_job
diff --git a/spec/lib/good_job/adapter_spec.rb b/spec/lib/good_job/adapter_spec.rb
index d99a4d360..d0a3303a5 100644
--- a/spec/lib/good_job/adapter_spec.rb
+++ b/spec/lib/good_job/adapter_spec.rb
@@ -200,6 +200,20 @@ def perform
     context 'when execution mode async_server' do
       let(:adapter) { described_class.new(execution_mode: :async_server) }
 
+      before do
+        scheduler = instance_double(GoodJob::Scheduler)
+        allow(GoodJob::Scheduler).to receive(:new).and_return(scheduler)
+
+        notifier = instance_double(GoodJob::Notifier, recipients: [])
+        allow(GoodJob::Notifier).to receive(:new).and_return(notifier)
+
+        poller = instance_double(GoodJob::Poller, recipients: [])
+        allow(GoodJob::Poller).to receive(:new).and_return(poller)
+
+        cron_manager = instance_double(GoodJob::CronManager)
+        allow(GoodJob::CronManager).to receive(:new).and_return(cron_manager)
+      end
+
       context 'when Rails::Server is defined' do
         before do
           stub_const("Rails::Server", Class.new)